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On your computer, look for “Control Panel” on the left menu and click it.
You will be taken to the “All Control Panel Items” page.
Click on “Ease of Access Center” as directed by the arrow from the figure below.
You will be taken to the below screen.
Click on “Make it easier to focus on tasks” as directed by the arrow from the figure below.
Click as directed by the arrow from the figure below.
You can now choose required time to show Notifications for longer duration as shown in the figure below.